Improvement in car-brakes



J. JOHNSON. Oar-Brake.

Patented June 4,1878.-

MPETERS. IHDTD-LJTHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

JOB JOHNSON, OF BROOKLYN, NEW YORK.

IM PROVEMENT IN CAR-BRAKES.

Specification forming part of Letters Patent No. 204,49 1, dated June 4, 1878; application filed April 8, 1878.

.To all whom it may concern.-

Be it known that I, Jon JOHNSON, of Brooklyn, in the county of Kings and State of New York, have invented an Improvement in Car- Brakes, of which the following is a specification:

I make use of friction-wheels upon the axles of the car-wheels, such friction-wheels having double conical surfaces, and the brake-shoes act at each side against such surfaces, the said shoes being at the ends of compound levers, and the toggle-bars, levers, and chains are arranged in such a manner relatively to the actuating hand-wheels that two pairs of brakes are operated by the hand-wheel at either end of the car.

In the drawing, Figure 1 is a plan of the truck and brake mechanism, and Fig. 2 is a vertical section of the parts at the line a a.

The car-wheels a a and axles b b are of usual character. 0 represents the truck-frame or carplatform. The pillar-blocks, axle-boxes, and springs are of any usual character. They, however, are not shown in the drawing.

Upon each axle there is a brake-wheel, 6!, made in two parts, bolted together at e, so that worn-out wheels can be removed and replaced by others.

I am aware that wheels have before been connected in this manner to car-axles. The faces of these brake-wheels are double truncated cones, with the bases together, so that they incline from the largest diameter each way toward the axle.

There is a frame, h, extending from one axle to the other, with cross-bars k, that connect the frames h together, and also support the brakelevers Z Z, that are placed in pairs adjacent to the respective brake-wheels d and swing upon the fulcrums i. There are supportingplates 0, between which and the bars 70 the levers l 1 swing, and there are guide-bars m, beneath which the levers ll move where the levers cross the bar k.

Each lever is provided with a shoe or brakeblock, a, hinged or pivoted to its end, and of a shape adapted to the face of the brakewheel.

It is generally preferable to suspend the brake-blocks by links 0 from a bracket or standard, 0, as shown by dotted lines in Fig. 2; but these may be dispensed with.

At the moving ends of the levers ll there are toggle-bars s s, hinged together and to the levers; and at the central hinges there are link-plates r, to which three connections are made. The first is by a chain, t, to the brakeshaft a, by means of which the toggle and its levers are operated by a direct connection to the brake-shaft u and its ordinary hand-wheel. The second connection is by the chain 4:, around the pulley w, to one of the rods y, that connects with the link-plate r of the adjacent brake-levers, and this forms the third connection, the parts being duplicated, so as to 0011- neet from one pair of brake-levers to the other and from the hand-brakes at both ends of the car.

There are shackles g to the bars or rods 3/, so as to adjust the length of the connecting parts, and cause the chain t, at one end of the car, to properly draw upon the rods 3 and chain '0 around its pulley w, and act upon the toggle-bars s of the adjacent brake with the same force, or nearly so, that it acts upon the toggles and brake-levers, to which such chain is directly connected.

By this means a powerful force is brought to bear against the brake-wheels to stop the car, and by this construction the. wheels are relieved from the wear and grinding action of the brake-shoes, and the truck-frame,pil1arblocks, journals, and boxes are relieved of the wear and strain consequent upon the application of the ordinary brakes.

I remark that, instead of the chains 1. pass ing to the hand-brake shafts, they might be connected to the ordinary air-brakes.

I claim as my invention 1. The combination, with the brake-wheels, of the shoes n, the levers l l for holding and operating such brake-shoes, the toggle-bars s, and the frame h k, supported upon the axles b, substantially as set forth.

2. The levers l 1, arranged in duplicate pairs, and provided with the brake-shoes and toggle-bars s, in combination with the chains t o, pulleys u, and connecting-rods y, substantially as set forth.

Signed by me this 22d day of March, A. D. 1878.

JOB JOHNSON.

Witnesses:

Gno. T. PINCKNEY, OHAs. H. SMITH. 

